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Вопрос по химии:
Вычислите среднюю молярную массу смеси состоящей из 3 л кислорода и 2 л водорода. Очень нужно пожалуйста!!!!!!-
Автор:
darling
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Ответ:
Объяснение:молярная масса равна m/n где m это масса вещества а n количество вещества
n=v/vm где vm равно 22
n1=3/22.4 n2=2/22.4
m=n*Mr
M(среднее)=m1+m2/n1+n2=n1Mr(O2)+n2Mr(H2)/n1+n2
Еще 4 ненужных тебе вопроса, но это важно для поиска
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Вопрос по геометрии:
Как найти сторону основания правильной треугольной пирамиды,если высота равна 6 см,а боковое ребро- 10 см-
Ответов: 2
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5 лет назад
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Вопрос по английскому языку:
Срочно
I _____________ to visit you yesterday, but you ___________ at home. (to want) (be, not)
Look! Sara (go) _____________ to the movies.
The teacher (probably/assign) ___________________ a test to his students next Monday.
By 9 o'clock, we (finish) __________________ our homework.
I (drive) ___________________ for two months now.
It is already 9:30 PM and I (wait) ________________ here for over an hour. If John does not (get) _____________ here in the next five minutes, I am going to leave.
I (be) _________ really angry at John yesterday. By the time he finally arrived, I (wait) ________________ for over an hour. I almost left without him.
Did you (hear) ____________ that Ben was fired last month? He (work) ________________ for that import company for more than ten years and he (work) _____________________ in almost every department. Nobody knew the company like he did.
Wait a minute, I _________________ this box for you. (to carry)
I (see) _______________ many pictures of the pyramids before I went to Egypt. Pictures of the monuments are very misleading. The pyramids are actually quite small.
Sarah (climb) _______________ the Matterhorn, (sail) ___________ around the world, and (go) _____________ on safari in Kenya. She is such an adventurous person.
Look! It _____________, so we can't go to the beach. (to rain)
Sarah (climb) ______________ the Matterhorn, (sail) ____________ around the world and (go) _____________ on safari in Kenya by the time she turned twenty-five. She (experience) _______________ more by that age than most people do in their entire lives.
(they / spend) _______________ their holidays in Paris last summer?
When Melanie came into the office yesterday, her eyes (be) ____________ red and watery. I think she (cry) ___________________.
By the time we get to Chicago this evening, we (drive) __________________ more than four hundred miles. We are going to be exhausted.
At 6 o'clock on next Friday they (sing) ___________________ the new song.
When he (wake up) ______________ yesterday , his mother (already /prepare) __________________ breakfast
When Sarah goes on vacation next month, she (study) __________________ German for over two years. She should be able to communicate fairly well while she is in Austria.
(you / ever / see ) ___________________ a whale?
I have not traveled much yet; however, I (visit) __________________ the Grand Canyon and San Francisco by the time I leave the United States.
I (finish) __________________ it by the end of this month.
By the time you finish studying the verb tense tutorial, you (master) __________________ all twelve tenses including their passive forms.
I (just / finish) ____________________ my homework.
Drive faster! If you don't hurry up, she (have) __________________ the baby by the time we get to the hospital.
Since 2011 they __________________ their son every year. (to visit)
I came to England six months ago. I started my economics course three months ago. When I return to Australia, I (study) ___________________ for nine months and I (be) ____________ in England for exactly one year.
At 8 o’clock, Andy (watch) _________________ a video when I arrive tonight.
Margie just called and said she would be here at 8 o'clock. By the time she gets here, we (wait) __________________ for her for two hours.
We _________________ TV when it started to rain. (to watch)
Frank just changed jobs again. If he keeps this up, he (change) __________________ jobs at least four or five times by the end of the year.
Sara usually (put) ____________ on black shoes but now she (wear) _________________ white trainers.
By the time the doctor (arrive) _____________ at the house last week, the patient (die) ________________.
The researcher (have) ____________ been exploring the territory (since/for) _________ last December.
Come over to my house around 9 o'clock. By then, I (complete) _____________ my history essay and we can go see a movie.
After Larry ______________ the film on TV, he decided to buy the book. (to see)
In June, my grandmother and grandfather (be) _______________ married for fifty years.
There are a lot of clouds! It ________________ soon. (to rain)
This time next week he (fly) ________________ to South Africa.
On December, 30th 2009, K.H Abdurrahman Wahid, the 4th president of Indonesia (die) _______ because of complications from kidney disorders, heart disease and diabetes.-
Ответов: 1
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5 лет назад
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Вопрос по физике:
Определите напряжение в цепи, если сопротивление цепи равно R=30 Ом при силе тока I=5 A.-
Ответов: 2
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5 лет назад
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Вопрос по алгебре:
какое из данных ниже чисел является значением выражения
[tex]( \sqrt{17} - 2) \times ( \sqrt{17} + 2)[/tex]
1)13
2)19
3)21
4)15
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Ответов: 1
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5 лет назад
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